746 lines
21 KiB
Plaintext
746 lines
21 KiB
Plaintext
The Present Extension
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Version 1.0
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2013-6-6
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Keith Packard
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keithp@keithp.com
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Intel Corporation
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1. Introduction
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The Present extension provides a way for applications to update their
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window contents from a pixmap in a well defined fashion, synchronizing
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with the display refresh and potentially using a more efficient
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mechanism than copying the contents of the source pixmap.
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1.1. Acknowledgments
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Eric Anholt <eric@anholt.net>
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Owen Taylor <otaylor@redhat.com>
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James Jones <janomes@nvidia.com>
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❄ ❄ ❄ ❄ ❄ ❄ ❄
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2. Data Types
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PRESENTEVENTID { XID }
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Defines a unique event delivery target for Present
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events. Multiple event IDs can be allocated to provide
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multiple distinct event delivery contexts.
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PRESENTNOTIFY {
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window: WINDOW
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serial: CARD32
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}
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A list of these is passed to PresentPixmap; when the indicated
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PresentPixmap completes, PresentCompletNotify events will be
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delivered both to the PresentPixmap window/serial parameter as
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well as each of the entries in the list of PRESENTNOTIFY parameter.
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PRESENTEVENTTYPE { PresentConfigureNotify,
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PresentCompleteNotify,
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PresentIdleNotify,
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PresentRedirectNotify }
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PRESENTEVENTMASK { PresentConfigureNotifyMask,
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PresentCompleteNotifyMask,
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PresentIdleNotifyMask,
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PresentSubredirectNotifyMask }
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PRESENTOPTION { PresentOptionAsync,
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PresentOptionCopy,
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PresentOptionUST }
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PRESENTCAPABILITY { PresentCapabilityAsync,
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PresentCapabilityFence,
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PresentCapabilityUST }
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PRESENTCOMPLETEKIND { PresentCompleteKindPixmap,
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PresentCompleteKindMSCNotify }
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PRESENTCOMPLETEMODE { PresentCompleteModeCopy,
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PresentCompleteModeFlip,
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PresentCompleteModeSkip }
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The Present extension also uses the Sync extension Fence data type to
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provide synchronization for pixmaps.
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❄ ❄ ❄ ❄ ❄ ❄ ❄
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3. Errors
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EventID
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A value for an EventID argument does not name a defined EventID
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❄ ❄ ❄ ❄ ❄ ❄ ❄
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5. Events
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ConfigureNotify events inform clients about window configuration
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changes which can affect the allocation of window-related buffers.
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CompleteNotify events inform clients about the completion of a pending
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PresentPixmap request.
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IdleNotify events inform clients when pixmaps are available for re-use.
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RedirectNotify events inform clients about other clients PresentPixmap
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requests.
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❄ ❄ ❄ ❄ ❄ ❄ ❄
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6. Extension Initialization
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The name of this extension is "Present"
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┌───
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PresentQueryVersion
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client-major-version: CARD32
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client-minor-version: CARD32
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▶
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major-version: CARD32
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minor-version: CARD32
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└───
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The client sends the highest supported version to the server
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and the server sends the highest version it supports, but no
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higher than the requested version. Major versions changes can
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introduce incompatibilities in existing functionality, minor
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version changes introduce only backward compatible changes.
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It is the clients responsibility to ensure that the server
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supports a version which is compatible with its expectations.
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Backwards compatible changes included addition of new
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requests.
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❄ ❄ ❄ ❄ ❄ ❄ ❄
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7. Extension Requests
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┌───
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PresentPixmap
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window: WINDOW
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pixmap: PIXMAP
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serial: CARD32
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valid-area: REGION or None
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update-area: REGION or None
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x-off, y-off: INT16
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target-crtc: CRTC or None
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wait-fence: FENCE
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idle-fence: FENCE
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options: SETofPRESENTOPTION
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target-msc: CARD64
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divisor: CARD64
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remainder: CARD64
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notifies: LISTofPRESENTNOTIFY
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└───
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Errors: Window, Pixmap, Match
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Provides new content for the specified window, to be made
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visible at the specified time (defined by 'target-msc', 'divisor'
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and 'remainder'). If the depth of 'pixmap' and 'window' do not
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match, a Match error will be generated.
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'serial' is an arbitrary client-specified value which will
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be returned in the associated PresentCompleteNotify event so
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that the client can associate the event and request.
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'valid-area' defines the portion of 'pixmap' which contains
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valid window contents, or None if the pixmap contains valid
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contents for the whole window.
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'update-area' defines the subset of the window to be updated,
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or None if the whole window is to be updated.
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PresentPixmap may use any region of 'pixmap' which contains
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'update-area' and which is contained by 'valid-area'. In other
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words, areas inside 'update-area' will be presented from
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'pixmap', areas outside 'valid-area' will not be presented
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from 'pixmap' and areas inside 'valid-area' but outside
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'update-area' may or may not be presented at the discretion of
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the X server.
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'x-off' and 'y-off' define the location in the window where
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the 0,0 location of the pixmap will be presented. valid-area
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and update-area are relative to the pixmap.
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PresentPixmap will block until 'wait-fence' is triggered.
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When the X server has finished using 'pixmap' for this
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operation, it will send a PresentIdleNotify event and arrange
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for any 'idle-fence' to be triggered. This may be at any time
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following the PresentPixmap request -- the contents may be
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immediately copied to another buffer, copied just in time for
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the vblank interrupt or the pixmap may be used directly for
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display (in which case it will be busy until some future
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PresentPixmap operation).
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If 'idle-fence' is not None, then the client guarantees to the
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X server that it will wait for that fence to be signalled
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before it uses the pixmap again. If 'idle-fence' is None, then
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the X server must arrange for the pixmap to be re-usable by
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the client as soon as the PresentIdleNotify event has been
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received. Note that if PresentCapabilityFence is set for the
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associated CRTC, then clients should use fences to improve
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overall systme performance. If PresentCapabilityFence is not
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set, then using fences offers no benefit, but also no cost.
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If 'target-msc' is greater than the current msc for 'window',
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the presentation will occur at (or after) the 'target-msc'
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field. Otherwise, the presentation will occur after the next
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field where msc % 'divisor' == 'remainder'.
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If 'target-crtc' is None, then the X server will choose a
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suitable CRTC for synchronization.
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If 'options' contains PresentOptionAsync, and the 'target-msc'
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is less than or equal to the current msc for 'window', then
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the operation will be performed as soon as possible, not
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necessarily waiting for the next vertical blank interval.
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If 'options' contains PresentOptionCopy, then 'pixmap' will be
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idle, and 'idle-fence' triggered as soon as the operation occurs.
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If 'options' contains PresentOptionUST, then target-msc,
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divisor and remainder will all be interpreted as UST values
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instead of MSC values and the frame update will be scheduled
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for the specified UST time, If the target-crtc supports
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PresentCapabilityUST, then the swap time will be as close to
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the target time as the driver can manage. Otherwise, the
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server will take the target UST time and convert it to a
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suitable target MSC value.
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After the presentation occurs, a PresentCompleteNotify event
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with kind PresentCompleteKindPixmap will be generated, both to
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'window' as well as all members of 'notifies'.
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If 'window' is destroyed before the presentation occurs, then
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the presentation action will not be completed.
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PresentPixmap holds a reference to 'pixmap' until the
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presentation occurs, so 'pixmap' may be immediately freed
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after the request executes, even if that is before the
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presentation occurs.
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If 'idle-fence' is destroyed before the presentation occurs,
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then idle-fence will not be signaled but the presentation will
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occur normally.
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If 'wait-fence' is destroyed before it becomes triggered, then
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the presentation operation will no longer wait for it and will
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occur when the other conditions are satisfied.
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┌───
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PresentNotifyMSC
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window: WINDOW
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serial: CARD32
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target-msc: CARD64
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divisor: CARD64
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remainder: CARD64
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└───
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Errors: Window
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Delivers a PresentCompleteNotifyEvent with kind
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PresentCompleteKindNotifyMSC after the time specified by
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'target-msc', 'divisor' and 'remainder').
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'serial' is an arbitrary client-specified value which will be
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returned in the event so that the client can associate the
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event and request.
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If 'target-msc' is greater than the current msc for 'window',
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the event will be delivered at (or after) the 'target-msc'
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field. Otherwise, the event delivery will occur after the next
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field where msc % 'divisor' == 'remainder'.
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If 'window' is destroyed before the event is delivered, then
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the event delivery will not be completed.
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┌───
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PresentSelectInput
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event-id: PRESENTEVENTID
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window: WINDOW
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eventMask: SETofPRESENTEVENT
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└───
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Errors: Window, Value, Match, IDchoice, Access
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Selects the set of Present events to be delivered for the
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specified window and event context. PresentSelectInput can
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create, modifiy or delete event contexts. An event context is
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associated with a specific window; using an existing event
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context with a different window generates a Match error.
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If eventContext specifies an existing event context, then if
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eventMask is empty, PresentSelectInput deletes the specified
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context, otherwise the specified event context is changed to
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select a different set of events.
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If eventContext is an unused XID, then if eventMask is empty
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no operation is performed. Otherwise, a new event context is
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created selecting the specified events.
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Specifying PresentSubredirectNotify Mask causes PresentPixmap
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requests on any child of 'window' from other clients to
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generate PresentRedirectNotify events to 'window' instead of
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actually performing the operation. However, only one client at
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a time can select for PresentRedirect on a window. An attempt
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to violate this restriction results in an Access error.
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┌───
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PresentQueryCapabilities
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target: CRTC or WINDOW
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▶
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capabilities: SETofPRESENTCAPABILITY
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└───
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Errors: Window, CRTC
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Returns the supported capabilities for the target CRTC. If
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'target' is a CRTC, then it is used as the target CRTC. If
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'target' is a WINDOW, then the target CRTC is selected by the
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X server from among the CRTCs on the screen specified by the window.
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PresentCapabilityAsync means that the target device can flip
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the scanout buffer mid-frame instead of waiting for a vertical
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blank interval. The precise latency between the flip request
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and the actual scanout transition is not defined by this
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specification, but is intended to be no more than a few
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scanlines.
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PresentCapabilityFence means that the target device can take
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advantage of SyncFences in the Present operations to improve
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GPU throughput. The driver must operate correctly in the
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absense of fences, but may have reduced performance. Using
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fences for drivers not advertising this capability should have
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no performance impact.
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PresentCapabilityUST means that the target device can scanout
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the image at an arbitrary UST time value, and is not driven by
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a periodic scanout timer. Applications specifying UST times
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for PresentPixmap can expect that their image will appear to
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the user within a short amount of time from that specified in
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the request. The precise accuracy of the scanout time is not
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defined by the extension, but is expected to be on the order
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of milliseconds or less.
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❄ ❄ ❄ ❄ ❄ ❄ ❄
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8. Extension Events
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┌───
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PresentConfigureNotify
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type: CARD8 XGE event type (35)
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extension: CARD8 Present extension request number
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sequence-number: CARD16
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length: CARD32 2
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evtype: CARD16 Present_ConfigureNotify
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eventID: PRESENTEVENTID
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window: WINDOW
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x: INT16
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y: INT16
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width: CARD16
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height: CARD16
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off_x: INT16
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off_y: INT16
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pixmap_width: CARD16
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pixmap_height: CARD16
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pixmap_flags: CARD32
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└───
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PresentConfigureNotify events are sent when the window
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configuration changes if PresentSelectInput has requested
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it. PresentConfigureNotify events are XGE events and so do not
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have a unique event type.
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'x' and 'y' are the parent-relative location of 'window'.
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┌───
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PresentCompleteNotify
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type: CARD8 XGE event type (35)
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extension: CARD8 Present extension request number
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sequence-number: CARD16
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length: CARD32 2
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evtype: PRESENTEVENTTYPE PresentCompleteNotify
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eventID: PRESENTEVENTID
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window: WINDOW
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kind: PRESENTCOMPLETEKIND
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mode: PRESENTCOMPLETEMODE
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serial: CARD32
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ust: CARD64
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msc: CARD64
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└───
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CompleteNotify events are delivered when a PresentPixmap or
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PresentNotifyMSC operation has completed.
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'kind' is PresentCompleteKindPixmap when generated by a
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PresentPixmap operation completion or
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PresentCompleteKindNotifyMsc when generated by a
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PresentNotifyMSC operation completion.
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'mode' is PresentCompleteModeCopy when the source pixmap
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contents are taken from the pixmap and the pixmap is idle
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immediately after the presentation completes. 'mode' is
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PresentCompleteModeFlip when the pixmap remains in-use even
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after the presentation completes. It will become idle no later
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than when the next PresentPixmap operation targeting the same
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window by any client completes. If the presentation operation
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was skipped because some later operation made it irrelevant,
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then 'mode' will be PresentCompleteModeSkip.
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'serial' is the value provided in the generating PresentPixmap
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request.
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'msc' and 'ust' indicate the frame count and system time when
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the presentation actually occurred.
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┌───
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PresentIdleNotify
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type: CARD8 XGE event type (35)
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extension: CARD8 Present extension request number
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sequence-number: CARD16
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length: CARD32 0
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evtype: PRESENTEVENTTYPE PresentIdleNotify
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eventID: PRESENTEVENTID
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window: WINDOW
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serial: CARD32
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pixmap: PIXMAP
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idle-fence: FENCE
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└───
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IdleNotify events are delivered when a pixmap used in a
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PresentPixmap operation may be re-used by the client.
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'window' is the window from the PresentPixmap to which this
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event is delivered.
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'serial' is the value provided in the associated PresentPixmap
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request.
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'pixmap' is the pixmap which is ready for re-use.
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'idle-fence' is the fence which was provided in the
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originating PresentPixmap request and is used to synchronize
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rendering between the client and the X server's use of the
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buffer. If not None, then the client must wait for the fence
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to be signaled before using the pixmap.
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┌───
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PresentRedirectNotify
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type: CARD8 XGE event type (35)
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extension: CARD8 Present extension request number
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sequence-number: CARD16
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length: CARD32 17 + 2 n
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evtype: CARD16 Present_RedirectNotify
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update-window: BOOL
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eventID: PRESENTEVENTID
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event-window: WINDOW
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window: WINDOW
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pixmap: PIXMAP
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serial: CARD32
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valid-area: REGION
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update-area: REGION
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valid-rect: RECTANGLE
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update-rect: RECTANGLE
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x-off, y-off: INT16
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target-crtc: CRTC
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wait-fence: FENCE
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idle-fence: FENCE
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options: SETofPRESENTOPTION
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target-msc: CARD64
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divisor: CARD64
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remainder: CARD64
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notifies: LISTofPRESENTNOTIFY
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└───
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RedirectNotify events are delivered when the client has
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selected for SubredirectNotify the parent of the target
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window. All of the values provided to the PresentPixmap
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request are provided. If the client simply passes these
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parameters back to the X server, the effect will be as if the
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original client executed the request.
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If 'update-window' is TRUE, then there are clients who have
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requested composite automatic redirect on the window and who
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presumably expect the window buffer to eventually contain
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the application provided contents. The compositing manager
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should at least occasionally update the window buffer with
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suitable contents. The precise update interval is left to the
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discretion of the client receiving this event.
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❄ ❄ ❄ ❄ ❄ ❄ ❄
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9. Extension Versioning
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|
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1.0: First published version
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❄ ❄ ❄ ❄ ❄ ❄ ❄
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10. Relationship with other extensions
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As an extension designed to support other extensions, there is
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naturally some interactions with other extensions.
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10.1 GLX
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GLX is both an application interface and an X extension. OpenGL
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applications using the GLX API will use the GLX extension and may use
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the Present extension to display application contents.
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10.2 DRI3
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The DRI3 extension provides a way to share direct rendered pixel data
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with the X server as X pixmaps. When used in conjunction with Present,
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they provide a complete direct rendering solution for OpenGL or other
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APIs.
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10.3 DRI2
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Present provides similar functionality to the DRI2SwapBuffers and
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requests, however Present uses X pixmaps to refer to the new window
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contents instead of the DRI2 buffer attachments.
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Present and DRI3 are designed in conjunction to replace DRI2
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10.4 XvMC / Xv
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It might be nice to be able to use YUV formatted objects as Present
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sources.
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❄ ❄ ❄ ❄ ❄ ❄ ❄
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Appendix A. Protocol Encoding
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Syntactic Conventions
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This document uses the same syntactic conventions as the core X
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protocol encoding document.
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A.1 Common Types
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┌───
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PresentEventType
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0 PresentConfigureNotify
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1 PresentCompleteNotify
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2 PresentIdleNotify
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3 PresentRedirectNotify
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└───
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┌───
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PresentEventMask
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1 PresentConfigureNotifyMask
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2 PresentCompleteNotifyMask
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4 PresentIdleNotifyMask
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8 PresentRedirectNotifyMask
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└───
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┌───
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PresentOption
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1 PresentOptionAsync
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2 PresentOptionCopy;
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4 PresentOptionUST
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└───
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┌───
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PresentCapability
|
|
1 PresentCapabilityAsync
|
|
2 PresentCapabilityFence
|
|
4 PresentCapabilityUST
|
|
└───
|
|
|
|
┌───
|
|
PresentCompleteKind
|
|
0 PresentCompleteKindPixmap
|
|
1 PresentCompleteKindMSCNotify
|
|
└───
|
|
|
|
┌───
|
|
PresentCompleteMode
|
|
0 PresentCompleteModeCopy
|
|
1 PresentCompleteModeFlip
|
|
2 PresentCompleteModeSkip
|
|
└───
|
|
|
|
┌───
|
|
PresentNotify
|
|
4 Window window
|
|
4 CARD32 serial
|
|
└───
|
|
|
|
A.2 Protocol Requests
|
|
|
|
┌───
|
|
PresentQueryVersion
|
|
1 CARD8 major opcode
|
|
1 0 Present opcode
|
|
2 3 length
|
|
4 CARD32 major version
|
|
4 CARD32 minor version
|
|
▶
|
|
1 1 Reply
|
|
1 unused
|
|
2 CARD16 sequence number
|
|
4 0 reply length
|
|
4 CARD32 major version
|
|
4 CARD32 minor version
|
|
16 unused
|
|
└───
|
|
|
|
┌───
|
|
PresentPixmap
|
|
1 CARD8 major opcode
|
|
1 1 Present opcode
|
|
2 18+2n length
|
|
4 Window window
|
|
4 Pixmap pixmap
|
|
4 CARD32 serial
|
|
4 Region valid-area
|
|
4 Region update-area
|
|
2 INT16 x-off
|
|
2 INT16 y-off
|
|
4 CRTC target-crtc
|
|
4 SyncFence wait-fence
|
|
4 SyncFence idle-fence
|
|
4 CARD32 options
|
|
4 unused
|
|
8 CARD64 target-msc
|
|
8 CARD64 divisor
|
|
8 CARD64 remainder
|
|
8n LISTofPresentNotify notifies
|
|
└───
|
|
|
|
┌───
|
|
PresentNotifyMSC
|
|
1 CARD8 major opcode
|
|
1 2 Present opcode
|
|
2 10 length
|
|
4 Window window
|
|
4 CARD32 serial
|
|
4 unused
|
|
8 CARD64 target-msc
|
|
8 CARD64 divisor
|
|
8 CARD64 remainder
|
|
└───
|
|
|
|
┌───
|
|
PresentSelectInput
|
|
1 CARD8 major opcode
|
|
1 3 Present opcode
|
|
2 4 length
|
|
4 EventID event-id
|
|
4 Window window
|
|
4 SETofPRESENTEVENTMASK event-mask
|
|
└───
|
|
|
|
┌───
|
|
PresentQueryCapabilities
|
|
1 CARD8 major opcode
|
|
1 4 Present opcode
|
|
2 2 length
|
|
4 CRTC or Window target
|
|
▶
|
|
1 1 Reply
|
|
1 unused
|
|
2 CARD16 sequence number
|
|
4 0 reply length
|
|
4 SETofPRESENTCAPABILITY capabilities
|
|
└───
|
|
|
|
A.3 Protocol Events
|
|
|
|
┌───
|
|
PresentConfigureNotify
|
|
1 35 XGE
|
|
1 CARD8 Present extension opcode
|
|
2 CARD16 sequence number
|
|
4 2 length
|
|
2 0 PresentConfigureNotify
|
|
2 unused
|
|
4 CARD32 event id
|
|
4 Window window
|
|
2 INT16 x
|
|
2 INT16 y
|
|
2 CARD16 width
|
|
2 CARD16 height
|
|
2 INT16 off x
|
|
2 INT16 off y
|
|
|
|
2 CARD16 pixmap width
|
|
2 CARD16 pixmap height
|
|
4 CARD32 pixmap flags
|
|
└───
|
|
|
|
┌───
|
|
PresentCompleteNotify
|
|
1 35 XGE
|
|
1 CARD8 Present extension opcode
|
|
2 CARD16 sequence number
|
|
4 2 length
|
|
2 1 PresentCompleteNotify
|
|
1 CARD8 kind
|
|
1 CARD8 mode
|
|
4 CARD32 event id
|
|
4 Window window
|
|
4 CARD32 serial
|
|
8 CARD64 ust
|
|
|
|
8 CARD64 msc
|
|
└───
|
|
|
|
┌───
|
|
PresentIdleNotify
|
|
1 35 XGE
|
|
1 CARD8 Present extension opcode
|
|
2 CARD16 sequence number
|
|
4 0 length
|
|
2 2 PresentIdleNotify
|
|
2 unused
|
|
4 CARD32 event id
|
|
4 Window window
|
|
4 CARD32 serial
|
|
4 Pixmap pixmap
|
|
4 SyncFence idle-fence
|
|
└───
|
|
|
|
┌───
|
|
PresentRedirectNotify
|
|
1 35 XGE
|
|
1 CARD8 Present extension opcode
|
|
2 CARD16 sequence number
|
|
4 18+2n length
|
|
2 3 PresentRedirectNotify
|
|
1 BOOL update-window
|
|
1 unused
|
|
4 CARD32 event id
|
|
4 Window event-window
|
|
4 Window window
|
|
4 Pixmap pixmap
|
|
4 CARD32 serial
|
|
|
|
4 Region valid-area
|
|
4 Region update-area
|
|
8 Rectangle valid-rect
|
|
8 Rectangle update-rect
|
|
2 INT16 x-off
|
|
2 INT16 y-off
|
|
4 CRTC target-crtc
|
|
4 SyncFence wait-fence
|
|
4 SyncFence idle-fence
|
|
4 CARD32 options
|
|
4 unused
|
|
8 CARD64 target-msc
|
|
8 CARD64 divisor
|
|
8 CARD64 remainder
|
|
8n LISTofPRESENTNOTIFY notifies
|
|
└───
|
|
|
|
A.4 Protocol Errors
|
|
|
|
The DRI3 extension defines no errors.
|
|
|
|
❄ ❄ ❄ ❄ ❄ ❄ ❄
|